Can we say food chain is a sequence of eating and being eaten to transfer energy

What occupation did muhammad have before the first revelation

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

Is there any solid scientific evidence that humans have been cloned?